Coating Adhesion Measurement Device Using Low-Force Stylus
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Solution Overview
Problem
Current methods for evaluating the drying and curing of coatings, films, and adhesives are often subjective and provide limited quantitative assessment, failing to accurately measure drying events and adhesion properties, especially for delicate samples that require low initial static forces and are prone to damage.
Innovation Solution
A device comprising a platform, a probe with a load cell sensor, and a control system that allows for precise movement and load control, enabling the measurement of drying, curing, and adhesion properties by sensing friction and angle changes, thereby reducing static loads and side loading forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional adhesion testing methods (tape peel, impact flexibility, lap joint) are used, then adhesion properties can be evaluated, but the methods require large amounts of material surface area and are not repeatable
Solution Approach 1:
The patent divides the adhesion testing process into controlled segments: a stylus applies force to a small defined area of the coating, creating a scratch or mar. The testing is segmented into controlled passes with specific force applications, allowing repeatable measurements on minimal surface area while maintaining measurement precision.
2Measurement precision
If high forces are applied during adhesion testing, then adhesion properties can be measured, but delicate samples are damaged
Solution Approach 1:
The patent employs dynamic force application through the stylus, controlling the magnitude and duration of force applied to the coating. The system dynamically adjusts testing parameters to measure adhesion on delicate samples without causing excessive damage, allowing accurate measurement while preserving sample integrity for further testing.
Solution Approach 2:
The patent applies partial action by using minimal necessary force to create scratches or marts that are sufficient for adhesion measurement but not excessive enough to completely destroy the coating. This allows measurement of adhesion properties while maintaining enough coating material for additional tests.
3Measurement precision
If subjective assessment methods (finger touch) are used to determine drying, then the process is simple, but the measurements are not quantitative or reproducible
Solution Approach 1:
The patent replaces the subjective mechanical finger touch method with an instrumented stylus system that mechanically interacts with the coating surface. The stylus applies controlled forces and measures responses (friction, angle changes) to provide quantitative, objective data about drying and curing states, eliminating subjectivity while maintaining operational simplicity through automation.
Solution Approach 2:
The system incorporates feedback mechanisms where the stylus continuously monitors coating properties during testing. The control system processes stylus responses and provides feedback about drying/curing status, enabling quantitative measurement of film formation while managing device complexity through automated control algorithms.
4Productivity
If initial static forces are applied to delicate samples, then testing can begin, but the samples are prone to damage
Solution Approach 1:
The patent applies preliminary action by first establishing contact between the stylus and coating surface with minimal force before applying full testing loads. This preliminary positioning allows the system to begin testing quickly while protecting delicate samples from immediate high-force damage, balancing productivity with sample preservation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides quantitative and reproducible measurements of drying events and adhesion properties, allowing for the evaluation of delicate samples with low initial static forces and minimizing damage, while enabling the assessment of scratch and mar resistance.
Implementation Method 1
a probe with a load cell sensor
Implementation Method 2
an angle sensor configured to measure the angle of the probe relative to the platform
Data Source
AI summary
Provided are material testing devices and methods for measuring certain physical properties of materials, such as for example, drying, curing, film formation, friction, adhesion, print resistance, and scratch resistance. The testing device includes a platform, a stylus comprising a probe, an angle sensor, a linear position sensor, a control system with a power supply and a control center which may be programmed with testing parameters.